The kan-extensions package

[ Tags: bsd3, comonads, data-structures, functors, library, monads ] [ Propose Tags ]

Kan extensions, Kan lifts, various forms of the Yoneda lemma, and (co)density (co)monads


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Versions 0.1, 0.1.1, 0.1.2, 0.2, 0.2.1, 0.2.2, 0.5.0, 0.5.1, 1.8.0, 1.9.0, 2.0.0, 2.0.0.1, 2.0.0.2, 2.0.0.3, 2.0.1, 2.0.2, 2.1, 2.1.2, 2.2, 2.3, 2.4, 2.4.0.1, 2.5, 2.6, 2.7, 3.0, 3.1, 3.1.0.1, 3.1.0.2, 3.1.1, 3.1.2, 3.4, 3.5, 3.5.1, 3.6, 3.6.2, 3.7, 4.0, 4.0.1, 4.0.2, 4.0.3, 4.1, 4.1.0.1, 4.1.1, 4.2, 4.2.1, 4.2.2, 4.2.3, 5, 5.0.1, 5.0.2
Change log CHANGELOG.markdown
Dependencies adjunctions (>=4.2 && <5), array (>=0.3.0.2 && <0.6), base (>=4.4 && <5), comonad (>=4 && <6), containers (>=0.4 && <0.6), contravariant (==1.*), distributive (>=0.2.2 && <1), fail (>=4.9 && <5), free (==4.*), mtl (>=2.0.1 && <2.3), semigroupoids (>=4 && <6), tagged (>=0.7.2 && <1), transformers (>=0.2 && <0.6) [details]
License BSD3
Copyright Copyright (C) 2008-2016 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <ekmett@gmail.com>
Category Data Structures, Monads, Comonads, Functors
Home page http://github.com/ekmett/kan-extensions/
Bug tracker http://github.com/ekmett/kan-extensions/issues
Source repository head: git clone git://github.com/ekmett/kan-extensions.git
Uploaded Mon May 8 23:46:56 UTC 2017 by EricMertens
Distributions Arch:5.0.2, Debian:4.2.3, FreeBSD:4.2.2, LTSHaskell:5.0.2, NixOS:5.0.2, Stackage:5.0.2, Tumbleweed:5.0.2
Downloads 49081 total (1154 in the last 30 days)
Rating 2.25 (2 ratings) [clear rating]
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Status Docs uploaded by user
Build status unknown [no reports yet]
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Readme for kan-extensions-5.0.2

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kan-extensions

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This package provides tools for working with various Kan extensions and Kan lifts in Haskell.

Among the interesting bits included are:

  • Right and left Kan extensions (Ran and Lan)
  • Right and left Kan lifts (Rift and Lift)
  • Multiple forms of the Yoneda lemma (Yoneda)
  • The Codensity monad, which can be used to improve the asymptotic complexity of code over free monads (Codensity, Density)
  • A "comonad to monad-transformer transformer" that is a special case of a right Kan lift. (CoT, Co)

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on irc.freenode.net.

-Edward Kmett